Twinning and exsolution in an antiperthite |
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| Authors: | H Ried M Korekawa |
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| Institution: | 1. Institut für Kristallographie und Mineralogie der Universit?t Frankfurt, Senckenberganlage 30, 6000, Frankfurt, Germany (F.R.G.)
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| Abstract: | An antiperthite feldspar (composition of the main part An27.2 Ab69.2Or3.6) has been studied by x-rays and transmission electron microscopy. Complex twinning and exsolution on very fine scale are described for the first time for this compositional range. Evidence is given for a distinct intermediate region between the plagioclase and the potash feldspar. The formation of the crystal probably involves partial replacement, at least two step exsolution, and transformation of monoclinic plagioclase to triclinic plagioclase. |
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